I think having Wolverine would a better choice for box-office reasons. He's definitely gonna help the movie to draw more viewers. But creatively, I think Cable would be a better choice.

Right now, since FOX is willing to make more spin-offs (even though they don't attract that much compare to the original trilogy). I want them to not include Wolverine/Hugh Jackman in the movie and see how would this perform at the box-office. If it succeeds, good for them but if not, I hope this will serve as a lesson again and another wake-up call moment for FOX.